Above-ground nuclear weapons tests were mostly this, especially later on. After a point, they weren't testing to see if it worked, or what it could do, they were just blowing stuff up for the sake of blowing stuff up. The higher-ups usually justified it as intimidating the filthy communists/capitalist pigs.
Tsar Bomba being a 50 megaton atomic bomb that the Russians let off during the Cold War... Could have been 100 megatons on paper, but the Russians were concerned about fallout and the fact that the plane dropping it wouldn't had escaped the blast radius even with parachute retardation so it was scaled down to the 50 megatons that was set off. They only made and detonated the 50 megaton one... Not practical to put on a plane. note : most early air dropped atomic weapons had parachutes so that the drop plane could get out of the blast zones of the weapon and since this effected the aim of the bomb a lot and generally made them off target the bombs had to have massive yields to ensure even being off target by a few miles wouldn't matter too much with massive blast radius the invention of ICBMs and reasonable accurate delivery of warheads allowed for nuke yields to scale back to less overkill yields
Ultimate example: The Big Bang!
Properly described, the Big Bang wasn't really an explosion at all, but more like a balloon swelling up at a steady rate. The phrase "Big Bang" was concocted by an advocate of the rival "steady state" cosmological theory, and was intended to poke fun at the notion that the universe arose from a single point's expansion. But the idea of all creation bursting forth from the mother-of-all-Bangs was so captivating that this trope supplanted the swelling-balloon image in popular culture.
Usually backronymed as 'Blast Levelling Everything Very Effectively'.
Grain elevator dust explosion, triggered by sparks from seized bearing.
The Halifax Explosion earns the distinction of being the most devastating accidental, non-nuclear explosion in history, leveling an entire neighborhood and was powerful enough to generate a deadly tsunami.
Before the term went to describe the use of anti-personnel and anti-vehicle explosive devices, mine warfare was the practice of digging a gallery under an enemy fortification or trench line, make a chamber, fill it with explosive and blow up the whole thing. This kind of mine warfare reached the apex on the Italian front of World War I, where the Italians and the Austro-Hungarians, having to deal with otherwise unconquerable positions on the top of mountains, started blowing them up this way, ultimately resulting in the 34th explosion literally blowing up the top of an Italian-held mountain and making both sides stop before things got really out of hands-especially as the Italians were putting together a bigger bomb when they stopped.
The largest deliberate artificial non-nuclear explosions were the "Minor Scale" and "Misty Picture" ordnance tests, conducted by the United States government to gather data and test the resilience of military hardware against the sorts of blast and heat effects that could be caused by nuclear attacks.
In his book Project Orion, George Dyson says of his father who worked on Project Orion, Freeman Dyson, that physicists love explosions. He shares an anecdote about how when he was cooking breakfast on a gas oven, he accidentally turned the gas valve up too high, causing a flash of flame to burst out as his father was entering the room. Freeman's reaction was to say, "Oh good, an explosion!"
Samsung's Galaxy Note 7 phablet smartphone was notorious for defective batteries combusting; one user had his phone blow up on him while he was sleeping in a hotel room and another phone-splosion destroyed a car, to name a couple of examples. On top of that, airlines started banning the use or even just carrying of the device out of safety concerns. Samsung pushed out an update to Note 7's that stop charging at 60%, and Verizon pushed out an update to Note 7's that warns the user to stop using the device. They eventually rolled out the Galaxy Note 8 the following year to replace the flawed Note 7.
The largest artificial non-nuclear explosion in history was created by a Soviet N1 rocket, the launch vehicle for their equivalent of the Apollo Program. During its second launch, a fuel pump ingested a loose bolt and exploded inside the rocket. This set off a chain reaction that caused the rocket's engines to shut down, dropping it back onto the launchpad. The entire vehicle blew up on impact, destroying the launch tower along with it. The Soviets never did get an N1 into orbit.
Watch any documentary about the early days of NASA and you'll probably see a montage of several Vanguard and Atlas rockets blowing up, usually right after they're launched (fortunately, these were unmanned test flights). Reporters jokingly referred to such rockets as "Kaputnik" or "Stayputnik," a play on the Russian satellite Sputnik.